Corner board



FIG. 1 is a rear perspective view of a corner board showing our new design;

FIG. 2 is a rear elevational view thereof;

FIG. 3 is a front elevational view thereof;

FIG. 4 is a left side view thereof, the right side view being a mirror image thereof;

FIG. 5 is a top plan view thereof; and,

FIG. 6 is a bottom plan view thereof.

The corner board is shown with a symbolic break in its length. The appearance of any portion of the corner board between the break lines forms no part of the claimed design. 

CLAIM The ornamental design for a corner board, as shown and described. 